[Bug] STR effects taken twice into account for effects

Hi :)

It looks like that with the rewrite of the damage script that for example STR effects are taken twice into account if doing a crit, resulting into that crits do more damage than they should :) (thanks to the report of Kath on Discord)

1. Give a character an STR: 4 effect for example
2. Roll damage with a weapon using STR as damage modifier, observe additional +2 as expected
3. Now roll a crit instead. The effect should usually add a +4 (the +2 times 2), if having a crit multiplier of x2. However, the bonus will be instead +8. Observe that the critical and the normal weapon damage die has the expected +4 :) Instead it should be +2 for the normal and crit die separately (adding totally to the expected +4 then)

Best wishes

Kelrugem

PS: Without extensions tested :)